I currently use TinyWall Firewall, it works very well, it’s small/portable, no complaints I even donated to the Dev but I would really prefer open source, also it needs to be user friendly like TinyWall so my non-tech family members can/will use it like they do with TinyWall.
9·6 months ago- https://github.com/pylorak/TinyWall
- https://github.com/Safing/portmaster
- https://github.com/henrypp/simplewall